Method of forming brake drums and apparatus therefor



March 27, 1934. J E BATlE 1,952,304

METHOD OF FORMING BRAKE DRUMS AND APPARATUS THEREFOR Filed Nov. 3, 1930.

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9 w I v ATTORN EYS- Patented Mar. 27, 1934 umreo stares 'METHOD OF FORMING BRAKEDRUMS AND V APPARATUS THEREFOR Joseph E. Batie, Detroit, 'Mich.,. assignor to Kelsey-Hayes Wheel Corporation,

Detroit,

Mich., a corporation of New York Application November 3, 1930, Serial No. 493,209

' '4 Claims; (o1. 29- 9o) The invention relates to apparatus for forming brake drums and refers more particularly to apparatus for ironing the brake flanges of drums.

Onev of the objects of the invention is to provide an improved apparatus which effectively irons the brake flange of a drum without marring its surface. Another object is to provide an improved apparatus which effectively irons the brake flange of a drum irrespective of its thick- 1 ness, which varies within certain limits in production. These and further objects of the in vention will. be apparent from the following description, taken in connection'with the accompanying drawing. in which Figure 1 is a central vertical section of anap- .paratus illustrating an embodiment of my invention; I

Figure 2 is a plan view thereof, with the parts broken away. The apparatus, as illustrated in the present instance, has the base 1 which comprises the table 2 and the legs 3. Mounted upon and secured to the table is the die holder 4 having the base 5 and the circular upright flange 6. 7 is a circular'die within theflange 6 and mounted upon and secured to the base 5. This die is engageable with the outer face of the brake flange 8 of the brake drum, which latter, when in place, has its web 9 I resting upon and supported by the ring IO-Which in turn is mounted upon the base 5.

A circular series of upwardly tapered rolls 11 is engageable with the inner face of the brake flange 8. Each of these rolls is secured to the lower end of a shaft 10",. which shaft extends 5, upwardly through and is journalled in a slide 12.

Each shaft has at its upper end a head 10' between which and the upper end of the slide there is the anti-friction bearing 13 for supporting the shaft upon the slide. Each slide 12 is slid- 4 able in a radially extending guideway 14 formed by a radial slot in the annular flange 15 of the lower section 16 of the carrier 17. Each slide has at its upper and lower ends retaining flanges 18 for preventing disengagement of the shoe from the carrier by a longitudinal movement of the slide relative to the carrier. Each slide is resiliently held in its innermost radial position by a coil spring 19 which extends radially of and is secured in the flange 15 and has its outer end abutting a plug 20 and its inner end abutting a slide.

The carrier 17 has the upper section 21 which is sleeved upon the lower section 16 and is loosely secured thereto by the shouldered bolts 22,

there being coil springs 23 under compression between the upper and lower sectionstending normally to separate these sections. The carrier is rotatably'supported upon the head 24 of a suitable machine, such as an automatic drill, by means of the circular flanged member 25 which is secured to the head. 26 and 26' are anti-friction bearings for respectively supporting the upper section of the carrier and forcing this section downwardly. 2'7 and 27" are thrust plates for engaging'the bearings 26 and 26Crespectively, these plates being encircled by the flanged member 25 and respectively resting thereon and clamped thereby against the head 24.

For the purpose'of moving the rolls 11 outwardly to engage the brake flange 8 and toforce this brake flange against the die "I, I have provided a plunger 28 which is movable axially of the die and has at its lower end the cam 29 formed with a downwardly tapered circular peripheral face. The tapered rolls are so mounted that the portions of their faces at the time of engagement with the inner faceof the brake flange'8 are vertical or parallel to the inner face of the die 7 and the portions of the faces of these rolls at the-"time of their engagement with the cammed memberfare inclined to the axis of the plunger, so that downward movement of the plunger cams the rolls radially outward. The plunger is designed to be carried by the rotatable spindle of the machine, such as an automatic drill, and to provide for relative I rotation between the plunger and the roll carrier, I have provided the bearing 30 between the shank of the plunger and the lower section 16 of the carrier. v

For the purpose of limiting the downward 9T) movement of the plunger, I have provided the post 32 which is mounted upon and extends up- Wardly from the base 5. Threadedly engaging this post is the abutment 33 which is engageable with To eject the brake drum after its brake flange has been ironed, I have provided the rods 39 which extend upwardly through the table 2 and. the base 5 and are engageable at their upper ends with the ring 10. The lower ends of these rods I rest upon the support 40 which is connected to no the rod 41 rigidly secured to a piston slidable Within the cylinder 42 carried by and depending from the table 2 and encircled by the legs 3. Fluid under pressure, such as compressed air, may be used for actuating the ejecting mechanism.

In operation, it will be seen that the rolls 11 will flrstlbelowered to the full extent into the brake drum, after which the plunger is lowered still more to cam the rolls radially outward into engagement with the brake flange of the drum and to carry this brake flange'against the die. The plunger is being rotated so thattas soonas its cam member comes into contactwith the rolls these rolls will be rotated causingothe same to travel over the brake flange. ;-As .a result, the

effective braking surface of this brake flange-is efiectively ironed regardless of variations in its thickness so that this brake'flangewill remain circular upon removal of the brake drum from the apparatus. After the ironing operation has been :completed, the plunger is first raised and during this initialraising operationthe coil springs act- .ing .upon thesslides supporting the rolls force these fislides radially-inward to disengagethe rollsfrom Jthe'brake flange. After disengagement of the irolls'ifrom the brake flange upward movement of therxheadcarries the roll carrier upwardlyv :By 'reason of this construction; marring of the. inner iacebfthebrake flange by withdrawal of the rolls is-zavoi'ded so that this inner face is highly finished FWhat-I- claim as my invention is:

alIIn: apparatus for forming brake drums, the combination with a die for engaging the brake flangetof the drum; of a carrier rotatably'mounted relative .to:the;die,'a plurality of: rolls mounted 6 upon the :carrier: i or movement radially I thereof intoandout'of engagement with the brake flange, means for-moving the rolls. radially. into-engagement'yvith the flange-for expanding the-same against the';die and also for rotating the rolls earoundlthe braking surface of the flange to iron :the: same-means operable'uponcompletion of the ironing operation tomove the rolls away from =said .flange, and means for subsequently: ejecting .gthfirbllflkfi drum from the die.

"apparatus for forming. brake drums, the

combination with a support for a brake drum, a die encircling the brake flange of the drum and a rotatable carrier movable toward and away from the drum, of a plurality of rolls projecting beyond the carrier and having shafts journaled in bearings. slidably andv rockably supported in the carrier for radial movement relative thereto, means for moving the carrier toward the drum for positioning the rolls in operative relation to the brake flange, yieldable means normally urging said rolls radially of the carrier away from the brake flange, "and 'means'forcamming said rolls into engagement'wvith the brake flange for expanding the samelagainstthe die.

.-3. In apparatusfor forming brake drums, the combination with. a support for a brake drum, a die encircling the brake flange of the drum and a carrier movable toward and away from the drum,

of-. a"plurality of rolls projecting beyond the carrier and having shafts journaled in bearings slidi ably and: rockably supported in 1 the carrier for radial movement relativethereto, means for. moving thescarrier-toward the drum forv positioning the rolls in operative relation to the brake flange, :and means for-moving said rolls radially into en- :gagementlwith the. brake flange for expanding the same: againstthe die.

A. In apparatus for formingrbrake drums,v the combinations-with: a' stationary: die for engaging the brake flange of the drum, ofla' carrier 'mounted for rotation relative to the die and movable toward and away from the drum, a plurality .of "bearings-mounted for sliding and rocking-movement within radial slots formed in'saidi carrier,

rollers 'for engaging the brake' 'fiange'of the "drum i "and having spindles journaledwithin said bearings, means for moving the carrier toward the drum forpositioning the rollers inoperative relation to thebrake flange, and means for camming said rollers into engagement with the brake flange for expanding therlatterl againstthe dieand for simultaneously rotating said rollers. about their .axes.

JOSEPH .BATIE. 

